Kensington Smartfit Conform Back Rest - BlackThe SmartFit Conform Back Rest takes sitting comfort to a new level, with patented back support technology that works in nearly any type of chair. The SmartFit System allows you to customize the height of the back rest to your personal comfort color for maximum support for your spine and lumbar. Ventilated back panels conform to your body type through four independent springs that articulate when you shift your posture. And because the panels are